Author(s): M. Ahmad, P. D. Mininni, M. Obligado, and J. A. Farnsworth We present evidence of the dynamical hysteretic nature of dissipation in unsteady turbulent flows. Wind tunnel experiments and direct numerical simulations in oscillating flows show that, at stationary mean Reynolds number, the dissipation constant is larger for decelerating flows. Consequently, a p… [Phys. Rev. Lett. 137, 044001] Published Mon Jul 20, 2026